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Catalyst 3750 Metro Switch Software Configuration Guide
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Chapter 21 Configuring SPAN and RSPAN
Configuring SPAN and RSPAN
To delete a SPAN session, use the no monitor session session_number global configuration command.
To remove a destination port from the SPAN session, use the no monitor session session_number
destination interface interface-id global configuration command. To remove the RSPAN VLAN from
the session, use the no monitor session session_number source remote vlan vlan-id.
This example shows how to configure VLAN 901 as the source remote VLAN and Gigabit Ethernet
port 2 as the destination interface:
Switch(config)# monitor session 1 source remote vlan 901
Switch(config)# monitor session 1 destination interface gigabitethernet1/0/2
Switch(config)# end
Creating an RSPAN Destination Session and Configuring Ingress Traffic
Beginning in privileged EXEC mode, follow these steps to create an RSPAN destination session, to
specify the source RSPAN VLAN and the destination port, and to enable ingress traffic on the destination
port for a network security device (such as a Cisco IDS Sensor Appliance).
Note Refer to the “Creating an RSPAN Destination Session” section on page 21-19 for details about the
keywords not related to ingress traffic. This procedure assumes the RSPAN VLAN has already been
configured.
Step 7
monitor session session_number
destination interface interface-id
Specify the RSPAN session and the destination interface.
For session_number, enter the number defined in Step 6.
Note In an RSPAN destination session, you must use the same
session number for the source RSPAN VLAN and the
destination port.
For interface-id, specify the destination interface. The destination
interface must be a physical interface.
Note Though visible in the command-line help string,
encapsulation replicate is not supported for RSPAN. The
original VLAN ID is overwritten by the RSPAN VLAN ID,
and all packets appear on the destination port as untagged.
Step 8
end Return to privileged EXEC mode.
Step 9
show monitor [session session_number]
show running-config
Verify the configuration.
Step 10
copy running-config startup-config (Optional) Save the configuration in the configuration file.
Command Purpose
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
no monitor session {session_number | all |
local | remote}
Remove any existing SPAN configuration for the session.
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